Either Byrons 30% or Oddonnels 30% . Dont waste your time using 20% on that engine. the engine will be easier to tune and more crisp throttle response with the 30%. Plus it will run cooler. My first choice would be the Byrons, and second Odonnels. Either one is the best, its just that the Odonnels leave the inside of the engine brown and the Byrons doesnt'. Those are your best choices, so whatever one is ready available to you, use it. You cant go wrong with either.